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3.2 Methods of separating and purifying substances

3.2 Methods of separating and purifying substances

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Question 20

An aqueous solution of lead(II) nitrate is reacted completely with an aqueous solution of potassium iodide.

The resulting mixture contains a brilliant yellow precipitate of lead(II) iodide suspended in a solution of potassium nitrate.

Describe how to obtain:

  • a pure, dry sample of solid lead(II) iodide from the mixture
  • a pure, dry sample of potassium nitrate crystals from the mixture
[4]
Markscheme

3.2 Methods of separating and purifying substances Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Methods of separating and purifying substances

107 exam-style questions on Edexcel GCSE Chemistry 3.2 Methods of separating and purifying substances, covering 3.2.1 Pure substances and mixtures, 3.2.2 Techniques for separating mixtures, 3.2.3 Paper chromatography and Rf values, and 3.2.4 Making water potable. Each one has a worked solution and a mark scheme showing where the marks go.

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